Magnet-support for electrical measuring instruments.



5 V J. H. ZIMMERMANN. MAGNET SUPPORT FOR ELECTRICAL MEASURING INSTRUMENTS.

APPLIOATION FILED NOT. 4, 1905.

921,051, Patented Mayll 1909.

2 SHBETSSHZBET 1.

v v NVE Ton I W 0 BY 4 AT ORNEY I all whom it may concern;

Be it known that I, JOHN H. ZiimicnnAN s",

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JOHN nfzrinnannin, or enthuses-no, PENNSYLVANIA ELECTRIC & mantra-urn?Inxo COMPANY, A cor PUI-KA'JJUN OF PENNSYLVANIA.

. MAGNET-SUPPORT FOR ELECTRICAL MEASURING INSTRUMENTS.

a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny 7 Specification of Letters Patentf Application filed November 4, 1905. Serial No. 285,861.

and State of Pennsylvania, have invented a l new and useful lrn'iroveinent ,in Magnet- 1 Supports for Elec ical Measuring lnstruments, of which the following is a specificatlon. i

My invention relates tofelectrical measuri mg instruments and has special reference to suchinstruments as are provided with rota-' means'fior supporting a plurality of permanent dam ing magnets in electricalinstrw' ments which shall be simple in construction and which shall permit of an adjustment of the magnets in a of the disk upon which the magnets act.

In electrical measuring instruments which are provided with rotatable disks, it is advisa le, in order to regulate the speed of the rotating member, to provide one or more clamping magnets which shall be so assembled with respect to the disk as to cause it to rotate in the magnetic field set up by the magnets. In accordance with my present invention, I employ two magnets, by means of which a relatively wide air-gap may be provided for the operation of the disk, and I mount the magnets in invariable relation .to

' each other and ment.

h provide means for adjusting 1) order to facilitate calibration of the instrun In the accompanying drawings, Figure 1 is a front elevat on of an electrical measuring instrument having a magnet support constructed in accordance with my invention, a portion of the cover being removed. F' .2 1s 'a side elevation of a portion of the i strument shown in Fig. 1, and Figs. 3, 4, 5, 6 and 7 are detail views of a modified form of magnet support.

Referring to the drawings, an electrical measuring instrument 1 comprises a rotatably mounted disk 2, a plurality of damping magnets 3 and 4 therefor and a'registering dial 5 of any well known construction, all of which are supported by a frame 6 that is mounted upon the back-plate of the instrument. The magnets 3 and 4 are n'gidly at-' tachcd to a strip or cross-piece 7, the ends of plane parallel to the plane em as a unit in a plane parallel to the disk.

piece 1 substantially in the center of their air-gaps,

Patented'May 1 1, 1909.

of rotation of the disk 2, and since the mag- I nets 3and 4 are so mounted upon the crosstable disks and cooperating damping nmgnets. i

The object of my invention is to provide that the disk maintains a position any adiustn'ient of the cross-piece in the recesscs 8 serves merely to vary the strength of the hold in which the disk rotates. The poother and to the cross-piece 7 is maintainer-l by a means of a plurality of *nets in position, the brackets 12, 13 and 15 being provided with lateral projections which engage the arms of the magnets.

Variations in size, form and arrangement of details may be made within the scope of my invention, and although I have shown a magnet support applied to aspecific type of instrument, this improvement may obvious'ly be applied to any other suitable type of instrument.

I claim as my invention? 1. In an electrical measuring instrument,-

i the combination with a frame having side channels, a rotatably mounted disk and-a plurality of damping magnets disposed end to end, of means for adjustably supporting said magnets, said means comprising a strip having lateral projections that engage the channels in the instrument frame, and means for suitably "fastening the. magnets to said str1p.- 4

means of. a luralit of clam in' supporting bracket 10, which engages Z one arm of each'magnet and is fastened to ASSIGNOR TO \K'ESTINGHOL SE The center ines ol' the recesses 8 are parallelto the plane sit-ion of the two magnets relative to each" 2. In anelee trical measuring instrument,

the combination with a frame having side channels, a plurality ofdan ping'permanent magnets disposed end to end and having their air-gaps in a single plane and a disk rotatably mounted in said air-gaps, of means for simultaneously adjusting said magnets in a plane parallel to the plane of rotation of the disk, said means comprising a strip havin lateral projections that engage the channe s in the instrument frame, and means for suitably fastening the magnets to said strip.

3. In an electrical measuring instrument, the combination with a frame having side channels, a rotatably mounted disk and a plurality of damping magnets disposed end to end, of means for so supporting said magnets that they are relativel fixed and are adjustable in a plane paralle to the plane of rotation of the disk, said means comprising a strip having lateral projections which engage the chann'els in the instrument frame, and means for suitably fastening the mag-' nets to said strip.

4. In an electrical measuring instrument, the combination with a frame having recesses, a rotatably mounted disk and a plurality of damping magnets therefor,'of means for adjustably supporting said magnets, said means comprising a strip provided with lateral projectlons to engage the recesses in the instrument frame, and a binding bracket which engages said magnets and is attached by binding screws to the strip.

5. In an electrical measurmg instrument,

the combination with a frame having re cesses, a plurality of damping .permanent magnets havin their air-gaps in a single plane and a dis rotatably mounted in said air-gaps, of means for simultaneously adjustmg said magnets in a plane parallel to the plane of rotation of the disk, said means comprising a strip having lateral projections which engage the recesses in the mstrument frame, and a bindin bracket which engages said magnets and 1s attached by binding screws to the strip.

6. In an electrical measuring instrument, the combination with a frame having recesses, a rotatably mounted disk and a plurality of damping magnets therefor, of means for so supporting said magnets that they are relatively fixed and are adjustable in a plane parallel to the plane of rotation of the disk said means comprising a strip having lateral projections which engage the recesses in the instrument frame, and a binding bracket which engages said magnets and is attached by binding screws to the stri In testimony whereof, I have hereunto subscribed my name this 21st day of Octo ber 1905.

JOHN H. ZIMMERMANN. 

